Hieam stevens maxim



(NpllodeL) l' l Mfrlionor N0.J38'7,651.

H. s.y MAXIM.. MAKING CARTRIDGE SHBLLS.

Patented Aug. 1`4', 1888.

www,

' Arrows-YS;

UNITED STATES PATENT OFFICE.

HIRAM STEVENS MAXIM, OF LONDON, ENGLAND.

METHOD OF MAKING CARTRIDGE-SHELLS.

SPECIFICATION forming part of Letters Patent No. 387,651, dated August 14, 1888.

Application filed October 1l, 1887. Serial No. 252,079. (No model.) Patented in England October 2. 1856. No. 12,56l, and October 22. 18st, No.13,534.

To all whom it may concern:

Be it known that 1, HIRAM STEVENS MAXIM, a citizen of the United States, residing at London, England, have invented certain new and useful Improvements in the Manufacture of Metallic Cartridge Cases, (for which I have obtained patents iu Great Britain, No. 12,561, dated October 2, 1886, and No. '13.534, dated October 22, 1886,) of which the following is a specification. I

My invention relates to a novel method of manufacturing cartridge-cases, whereby I am enabled to advantageously make the tubular parts thereof from a plate or sheet of steel o other hard and tough metal.

In the accompanying drawingsI have shown a cartridge-case in the various stages of its manufacture by my method.

Figure 1 isa longitudinal cross-section of a completed shell. Fig. 2 is a plan of a blank cut or stamped from a lsheet of steel for the manufacture of the tubular part of vthe cartridge. Fig. 3 is a side elevation illustrating the second step or stage in the manufacture of the cartridge. In making a cartridge-case according to my said invention I take a plate or sheet of steel or other metal of the required thickness and preferably of such. dimensions that a considerable number of cartridge-cases can be made therefrom. I cut or stamp from this plate a piece, A, of the required length, and 'of sub stantially the shape shown in Fig. 2, having 'teeth or serrations B at its edges, which are to be subsequently united. Each piece or blank thus produced isvbent into the form of a slightly-conical tube, as shown in Fig. 3, its toothed or serrated edges being interlocked or dovetailed together and then hammered and 40 braz'ed. vThe tube thus formed is then finished and the exact shape or configuration imparted thereto by placing it in a hardened-steel chamber and rolling it by means of a hardenedsteel roll applied to the interior of the said tube. The said tube is then firmly secured in any well-known or suitable manner in a groove in a metal head or base, O, of suitable construction. The whole ofthe cartridgecase is then galvanized or coated with vzinc or other metal, both 'externally andv internally.

By these improvements I am enabled to make very strong cartridge-cases. Moreover,

Vby-making the aforesaid steel chamber in which the cartridge is finished of the same internal dimensions and 'shape or configuration as the chamber of the gun in which the cartridges are to be used, I insure an accurate tit of the said cartridges in the chamber of the The teeth or serrations in the piece B may be of any other convenient form.

. What I claim is 1. Theimprovement inthe method or process of manufacturing cartridge-cases, which conssls in rstforming from sheet metal a blank with serrated edges, then bending the same and interlocking the serrated edges to form a tube, and then shaping or finishing said tube by inserting it iu a chamber of hard metal of the required shape or configuration and rolling it from the interior, as herein set forth.

2. The method or process of making cartridge-cases which consists' in punching or stamping from sheet-steel or similar metal a blank with serrated edges, bending the blank into tubular shape and interlocking the serrations, and then welding the serrated edges together and uniting a head or base to the tube, as set forth.

'In testimony whereofI have hereuntosgned 'my name in the presence of two subscribing witnesses.

. HIRAM STEVENS MAXIM.

Witnesses:

DAVID Yo UNG, WALTER Monats. 

